Nestus was the name of a region, a sector, a system, a sun, three moons, and the most known; the planet, the Home Planet of Big Bird. It was ruled by the Brotherhood of the Bird until their downfall. Then it was consumed in Chaos, and anarchy ruled the planet.
Many Sith Lords attempted to include the planet in their empires, but they failed. The Bird species which inhabited the planet were so much use to the Brotherhood that they would not let themsleves be ruled by others. They even avoided control by Darth Elmo, who attempted to include the Birds into Darth Darth Binks' empire, was defeated by the birds.

The original plan was for Nestus to be a planet with two poles, but otherwise very little land. So all the residents of Nestus would have to fly non-stop. Darth Lucas decided to go with the feathered planet you see above.